Loans And Allowance For Loan Losses (Schedule Of Loans Modified And Considered As Troubled Debt Restructured Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Number	3	9
Pre-Modification Recorded Investment	$ 1,468	$ 4,130
Post-Modification Recorded Investment	1,468	4,130
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number	2	2
Pre-Modification Recorded Investment	82	82
Post-Modification Recorded Investment	82	82
Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number		2
Pre-Modification Recorded Investment		2,479
Post-Modification Recorded Investment		2,479
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number	1	5
Pre-Modification Recorded Investment	1,386	1,569
Post-Modification Recorded Investment	1,386	1,569
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number
Pre-Modification Recorded Investment
Post-Modification Recorded Investment